docs: def get_valid_directory_list(input_directory):
      """
      Get a list of folders
      """
      valid_input_directories = []
      for directory in os.listdir(input_directory):
          if os.path.isdir(os.path.join(input_directory, directory)):
              valid_input_directories.append(directory)
          else:
              print("{0} not a directory. Skipping ...".format(directory))
      return valid_input_directories